Davesail,
Typically, when viewed from the rear of the boat:
The Port engine should be a "Left Hand Engine" and the flywheel should rotate Counter-clockwise. This is the "Normal" engine.
The Starboard engine should be a "Right Hand Engine" and the flywheel should rotate Clockwise. This is the "Reverse" engine.
You can also confirm this by finding the engine identification code. Perkins "Right Hand Engines" are identified by the letter "X" stamped immediately after the manufacturing location code letter (e.g. 354UX252T). The first three numbers are the cubic inch size, the next character is the manufacturing location. The "X" will be the next character if the engine is "Reverse Rotation". This identification is located on the Fuel Injection Pump Mounting Flange on the Left Side of the Engine.
Hope this helps.
LarryM
m/v Boomarang